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Please help me complete this equation Mg + 2HCl = MgCl2 +
Question Date: 2002-07-07
Answer 1:

This looks very much like a homework question to me. And you are almost done anyway. You just have to think about what is going to happen to the H+ ions.

When Magnesium reacts with hydrochloric acid it forms Magnesium chloride and the free H + ions get surrounded by water molecules. So a better way to balance this equation is to write:

Mg + 2 HCl + 2 H2O = MgCl2 + 2 H3O+

I hope this helps you understand the balance of this reaction a little bit better.

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